Tank-heater.



D. M. DUNLAP.

TANK HEATER.

APPLIGATION FILED JAN. 17, 1911.

Patented Sept. 26, 1911.

2 SHEBTS -SHEET 1.

D. M. DUNLAP.

TANK HEATER.

APPLIUATIUH FILED hum-1, 1911.

Patented Sept. 26, 1911.

2 SHEETS-SHEET 2 DAVIIl M. DUNLAP, 0F CHICORA, PENNSYLVANIA.

TA NK-HE ATER.

Specification of Letters Patent.

Patented Sept. 26, 1911.

Application filed January 17, 1911. Serial No. 603,053.

has for its objectto provide a simple, inexpensive and at the same timevery effective device for heating crude oil or other liquids containedin tanks for the purpose'of romoting its fluidity and mobility orparticles in transmission, and for other purposes.

Another objectof the invention to pro-' vide a furnace for heating oilfluids in a tank and causing a continuous circulation of the fluidbetween the tank andv the furnace.

With the above and other objects in view, I have invented the deviceillustrated in the accompanying drawings in which,

F igure 1 is s longitu inal vertical sectional view of a. tank andheater therefor. Fig. 2 is a longitudinal horizontal sectional viewtaken on the line 2 2 of Fig. 3. Fig. 3 is an end elevation of thedevice, and Fig. 4 is a transverse vertical sectional view taken on theline 4----l of Fig. 1. i

Referring to the accompanying drawings 1 indicates a tank and 2 afurnace.

3 an outlet for oil or other fluid con tained in the tank, by means ofwhich the Fluid is conveyed through a series of pipes 4, 5, o, '7, and8; the pipes 5 and 7 passing through i firebox 9 of lhe furnace anddirectly over the oil or gas burner 10, which is fed with fuel through,the feed pipe ll.

A. reservoir l2 is locfiled directly above and entirely ever the lirelam 1), and a mell; 13 is 'n'ovided to carry off the frrin the fire box.The fluid passes from the pipe S through the inlet 14 and. enter-stilereservoir l2, and when it is heated suiliciently, the expansion forcesit to pass through the outlet l5, and through the pipes l6. l? and 18into the bottom of the tank 1. A door '19 provided by means cl. whichaccess may be lied to the l'iurner i0 ht which it maybe lighted. Ahamper-alum :age 20 is connected with the reservoir 1,2, that thetemperalure of the fluid thcrcin may be ascertained any time.

The hirnace 2 has all its walls except ihe top wall thereof lined withasbestos or other n Jni-cQncluQtiug material, 2]., so that al the heatpossible may be retained within the furnace.

The top wall 22 of the firebox 9 is the bottom wall of the reservoir. Acheck valve 23 is located between the pipes 4 and 5 and prevents thefluid under expansion from being forced back through the same pipes intothe tank 1. All the various pipes are con neeted with. T-joints 24, andhave their outer ends closed with plugs 25, which may be re moved at anytime for the purpose of cleaning the pipes,

It will be seen from the fore oing descrip tion that the pressure of thevuid contained in the tank 1 will force the fluid to fill the pipes 5and 7 and the reservoir 12. The check valve will prevent a return of thefluid through the same channels when the fluid becomes heated andthereby expanded, con sequently the fluid is forced back into the bottomof the tank through the pipes 16, 1.7, and 18 and the heated fluidnaturally rises to the top of the tank and raises the temperature of allthe fluid contained in the tank, thus increasing the pressure in thetank and thereby assisting in forein the cooler portion of the fluidback throng the furnace or heater. :1. continuous circulation ismaintained between the tank and heater.

In pointing out more clearly the distinctive features of my invention, Iwould state that I am aware that in hot water heaters and various otherliquid heaters it has been common for many years to employ the rincipleof circulating the body of liqui be tween a reservoir or tank at onepoint, and a furnace or heater at another point, by means of pipes whichprovide a continuous circulation from the reservoir through the .heaterby expansion and the well known laws of convection, and I make no broa'dclaim to this principle. While my invention belongs tothis class ofliquid heaters, it is more especlfltlly designed for circulating heavypetrooil and it possesses important and distinctive features of novelty,among which only be mentioned the following: The reservoir 12, which isplaced above the furn ce fire box, is era-extensive with the fire box,or of the same ground plan, with the outer edges of the reservoircoincidin and fittin snugly to those of the heating 0 amber be ow, andas the top wall 22 of the fire box is the bottom Wall of the reservoirthere is a. direct- Itwill thus be seen thatv transmission of heat byconduction therethrough giving a high and. econon'iical heatingctiiciency, and as said reservoir is formed with dowmvardly projectingflanges 30, 30, 5 which corresporul in (llHlQnSlOllS to and fit over theedges of the tire box it renders it easy of construction andapplication, and also detachable when necessary to take it oitf. It.will also b8 380" that the heating chamber 10 is of rectangularelongated shape disposed l'iorizontally and that the heating pipe has along extension horizontally through the heating chamber and through bothends of the same and back again, which gives an ex tensive heatingsurface with perfectly straight pipes and brings the T-couplings E14 andclean-out lugs 23 outside of the front end of the eating chamber, wherethey are easily accessible. The relatively shall-ow liquid reservoir 12above the heating chamber also gives extensive heating surface along itsbottom over which the li. uid has to pass from end to end.

claim and desire to secure by Letters 25 Patent 2- 1. An apparatus forheating liquids by.

continuous circulation from convect1on,com-

rising a tank, a horizontal reetangular eating chamber, a relativelyshallow horizontal liquid reservoir laced immediately above the heatinchem er and bein coextensive in groun plan dimensions with the heatingchamber, with the outer edges of the reservoir coinciding with those ofthe heating chamber, a circulating pipe extending from the lower portionof the tank horizon tally through the length of the heating chamber andthrough the front end of the same and thence back through the heating 4Ochamber and its other end and up into one end of the reservoir above theheating chamher, and another circulating pipe extending from the otherend of the said reservoir to a the tank for return circulation.

2. An apparatus for heating liquids by continuous circulation -'fromconvection, comprisiu a tank, a horizontal rectangular heating 0lanlber, a relatively shallow horiheating chamber, with the outer edgesof the resei'\-'oir coii'iridiug with those of the heat ing chamber, acirculating pipe extending from the lower portion of the o kliorizoutally through the length of the, heating chamber and through thefront end of the same and thence back through the heating chamber andits other end and up into one end of the reservoir above the heatingchamber, another circulating pipe extending from the other end of thesaid reservoir to the tank for return circulation, and an escape finefrom the'heating chamber opening at its lower end into the heatingrlnnnl'icr and passing through the reservoir above.

3. An apparatus for heating liquids by continuous circulation fromconvectiomcom prising a tank, a horizontal rel-t angular heatingchamber, a relatively shallow horizontal liquid reservoir placedimmediately above the heating chamber and being coextensive in groundplan dimensions w1th the heating chamber, with the outer edges of the.reser-- voir coinciding with those of the heating chamber, a circulatingpipe extending from the lower portion of the tank horizontally throughthe length of the heating chamber and through the front end of the sameand thence back through the heating chamber and its other end and ppinto one end of the "reservoir above the heating chamber, and

another circulating pipe extending from the other end of the saidreservoir to the tank for return circulation, the reservoir above theheating chamber being formed with dmvnwardly projecting flanges alongits edges conforming in ground plan to the subjacent h ating chamber andlapping past the upper edg s of the heating chamber. In testimonywhereof I ailix my signature in presenc of two witnesses.

DAVID M. DUNLAP. W'i messes:

JOHN E. Aunucimn,

Gnonen M. GLASS.

